Sectional scroll-edged shearing-die.



c. D. McDONALD.

SECTIONAL SCROLL EDGED SHEARING DlE,

APPLICATION FILED on. 9. 1916.

I 1 ,235,21 6. Patented July 31, 1917.

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UNITED STATES PATENT OFFICE.

CHARLES D. MCDONALD, OF CHICAGO, ILLINOIS, ASSIGNOR TO MCDONALD MACHINE00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SECTIONAL SCROLL-EDGED SHEARING-DIE.

Application filed October 9, 1916.

T 0 all whom it may concern:

Be it known that I, CHARLES D. MCDON- ALD, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in SectionalScroll- Edged Shearing-Dies, of which the following is a specification.

The present invention relates to a sectional form of die for use inscroll shearing machines, of the general type embodied in Letters Patentof the United States No. 1,174,747, granted to Charles D. McDonald March7, 1916, and entitled Metal shearing machines.

The primary object of the invention is to produce a die of sectionalformation, thereby permitting the construction of a relatively thin die,whereby the cost of manufacturing the same is reduced, and eliminatingthe danger of the die warping, which is present when an integral thindie construction is used.

Further objects of the invention are, to arrange the die in such manneras to enable any portion thereof to be readily removed for the purposeof repair; and to provide simple and easy means for mounting andmaintaining in place a stripper for use in conjunction with said dies.

The invention further consists in the features of construction andcombination of parts hereinafter described and claimed.

In the drawings:

Figure 1 is a plan View of a die formed in accordance with the presentinvention;

Fig. 2, a section on line 22 of Fig. 1, looking in the direction of thearrows;

Fig. 3, a cross section through the die of the present invention, on asomewhat enlarged scale; and

Fig. 4, a perspective of one of the die sections.

In the art to which the present invention relates, there are certainmachines which use an elongated, double scroll-edged die for the purposeof shearing sheets of metal into scroll-edged blanks. These machines areof the character shown and described in the McDonald Patent No.1,174,747 heretofore referred to. 4

These dies are necessarily of an elongated nature, and it has been foundthat if the die be made sufficiently thick to withstand the action ofwarping, the cost, due to the Specification of Letters Patent.

Patented July 31, 1917.

Serial No. 124,711.

required use of tool steel in forming the same, would be so high as tomake it impractical of employment. If the die be made thin, so as toeliminate the high cost, and at the same time made of an integralconstruction, then, owing to its elongated character, it has a tendencyto warp, and in this particular class of die, a slight warping would befatal to the production of proper blanks.

In the present invention, the die is formed of a sectional nature,thereby allowing it to be made of a relatively thin piece of tool steeland eliminating the high cost of manufacture, but avoiding the use ofthe thin elongated strip, which was open to the objection of warping.

Referring now to the drawings, companion backing members 5 and 6 areemployed, which may be of any suitable metal and relatively cheap ofproduction as compared with the steel which must be used for the dies.Into the opposed faces of each of the backing members 5 and 6 areinserted scroll-edged die sections 7. .Each of the backing strips 5 and6 is recessed as at 8 (Fig. 3), and into this recess is inserted the diesections 7. These sections when united produce an elongatedscroll-shaped cutting edge 9, thereby producing a double scrolledgeddie.

The sections are each placed in position by the use of suitable threadedor other removable locking members 11, which extend in a recess 11 inthe backing portion, and which recess may be tapped or otherwise formedfor removably securing the locking members in place. The opening 12through the die section is countersunk as shown, to allow the head ofthe locking member to be inserted therein. Each of the die sections 7 isof suitable length, and when formed in this manner, can be maderelatively thin, so as to eliminate the use of an excessive amount oftool steel; and, at the same time, owing to the sectional formation,they are so short as not to warp when tempered. A die, therefore, isthus produced which is of an elongated nature necessary in this sort ofwork, and which is sufliciently thin to be practical ofmanufacture as tocost, and sufliciently short so that it will not warp even though madeof a thin character.

End or cross-cutting dies 13 are employed, which cons s f a block 14secured, by

means of suitable removable fastening members 15, to a strip 16removably connected to the bottom face of the base sections; and a sideedge trimming die 17 is employed, which is connected by suitableremovable fastening members 19 to one of the backing sections and restson an extension 18 from said backing section.

From the foregoing, it will be apparent that all portions of the cuttingpart of the die are made in short sections; and are, therefore, capableof being made thin, and at the same time will, owing to their shortness,not be open to the objection of warping. Any portion of the die whichshould become worn or broken can easily be removed and a new one placedin position without in any way affecting the remainder of the die.

A stripper member 20 is employed, which comprises a block 21, having abeveled face 22 thereon. This block is formed with slots 23, throughwhich extend removable fastening members 2st. A series of stems 25 aresecured to the lower face of the stripper bar (see Fig. 3), which stemsextend through ashoulder 26 on the backing member 5; and interposedbetween the upper face of this shoulder and the lower face of thestripper bar is a coil-spring 27 normally holding the stripper barupward. Suitable removable fastening members 28 are attached to thelower end of the stem 27 for holding it in place.

The slot 23, through which the fastening member 2a extends, is elongatedto allow the stripper to move up and down. The fastening member 2A,being of a detachable nature, allows the stripper to be removed at will.The operation of the stripper is evident. hen the sheet of metal inpassing across the die strikes the inclined face 20, said face deflectsthe work so as to prevent it from striking the edge of the die. Afterthe cut is made, the action of the spring 27 forces the stripper barupward, dislodging the cut metal, and thereby performing the usualfunction of a stripper. A stripper so constructed and mounted inposition is capable of being readily and quickly removed when desiredwithout interfering with any of the other parts.

It is apparent that any portion of the die constructed as abovedescribed can be removed at will without affecting in any way theremainder thereof. While the die as shown and described is one of afemale character, it is evident that it may be as readily employed inconnection with a die of the male character.

I claim:

1. An elongated scroll-edged shearing die, comprisingoppositely-disposed, spaced apart, relatively thick backing portions ofrelatively soft metal, a plurality of thin, short, scroll-edged dieportions of relatively hard metal, means for removably connecting saiddie portions to opposed faces of the backing portions, whereby there areproduced companion elongated, thin, sectional, scrolledged diesoppositely disposed and spaced apart from one another, a strip adjacenteach end of the backing portions, each of said strips being connected toeach of the backing portions and extending across from the bottom faceof one backing portion to the bottom face of the other backing portion,and an end die member removably secured to each of said strips andpositioned in the space between the opposed scrolledgcs dies,substantially as described.

2. An elongated scroll-edged shearing die, comprisingoppositely-disposed, spacedapart, relatively thick backing portions ofrelatively soft metal, a plurality of thin, short, scroll-edged dieportions of relatively hard metal, means for removably connecting saiddie portions to opposed faces of the backing portions, whereby there areproduced companion elongated, thin, sectional, scroll-edged diesoppositely disposed and spaced apart from one another, a strip adjacenteach end of the backing portions, each of said strips being connected toeach of the backing portions and extending across from the bottom faceof one backing portion to the bottom face of the other backing portion,a cross die removably secured to each of said strips and positioned inthe space between the opposed scroll-edged dies, a side edge trimmingdie, one of said backing por tions being configured at one end toreceive said trimming die, and removable means for securing saidtrimming die in place, substantially as described.

CHAS. D. MoDONALD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

